Integrated Magnetic and Energy Storage Properties of Nickel Cobaltite/Graphene/Iron Oxide Hybrid Nanomaterials

Hybrid nanostructures combining metal oxides with carbon‐based materials offer significant promise for multifunctional applications such as energy storage and magnetism. In this study, a magnetic ternary nanocomposite consisting of NiCo 2 O 4 /Fe 3 O 4 /rGO was synthesized via a modified chemical oxidation method for supercapacitor applications. X‐ray diffraction (XRD) confirmed the phase purity of NiCo 2 O 4 with an average crystallite size of ~11 nm. Morphological analysis using SEM and TEM revealed a porous structure composed of hexagonal NiCo 2 O 4 plates (120–240 nm), Fe 3 O 4 nanoparticles (20–150 nm), and interconnected reduced graphene oxide (rGO) nanosheets extending a few micrometers. Vibrating Sample Magnetometry studies indicated a moderate saturation magnetization of 40 emu/g. Electrochemical characterization demonstrated that the NiCo 2 O 4 /Fe 3 O 4 /rGO electrode delivered a high specific capacity of 173.5 C/g at 0.5 A/g, along with excellent cycling stability, retaining 87.1% of its capacity over 8000 cycles at 10 A/g. The improved performance is attributed to the synergistic integration of conductive rGO and magnetic Fe 3 O 4 into the NiCo 2 O 4 matrix, which enhances ion diffusion, electrical conductivity, and mechanical integrity while increasing the number of electroactive sites. These results establish the NiCo 2 O 4 /Fe 3 O 4 /rGO nanocomposite as a robust and efficient electrode material for next‐generation high‐performance supercapacitors.